The UK Anti-Doping agency (UKAD) has closed its Team Sky "mystery package" probe and will not be making any charges, it has announced.
Team Sky have come under the microscope in recent months after an investigation was launched into a package ordered by former team doctor Richard Freeman and delivered to former Tour de France winner Bradley Wiggins at the 2011 Criterium du Dauphine race.
UKAD said it had been "unable" to prove that the package delivered to Team Sky contained Fluimucil.
"Put simply, due to the lack of contemporaneous evidence, UKAD has been unable to definitively confirm the contents of the package," UKAD said in a statement.
"In light of the significant public interest in this particular investigation, which has previously been discussed by the Parliamentary Select Committee for Digital, Culture, Media and Sport, UKAD can confirm that this investigation has now been drawn to a close," it added.
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"It follows that UKAD does not intend to issue any anti-doping charges in relation to the package."
UKAD chief executive Nicole Sapstead said a lack of accurate records had caused problems.
"Our investigation was hampered by a lack of accurate medical records being available at British Cycling," she said. "This is a serious concern."
